OM617

https://imgur.com/a/6Zy47

Car starts after 45-60 seconds of cranking. I've ruled out glow plugs. When I took the injector hard-lines off, I found that one injector was almost completely dry of fuel. Here is a picture of the dry injector (right) and wet one (left).

Is it air in the fuel system? Is the fuel-return hose clogged somehow? Any information is a huge help. Thank you.